The Grand Seiko 4520-7020 is a Hi-Beat manual wind watch of the 45GS family.
This watch was not for sale, and never appeared in an official Seiko catalog.
Stainless Steel
| Ref. | – |
| Case-movement ref. | 4520-7020 |
| Year | ? |
| Caliber | 4520A |
| Jewels | 25 |
| Bph | 36,000 |
| Type | Hi-Beat Manual Wind |
| Family | 45GS |
| Branch | Daini Seikosha |
| Material | Stainless Steel |
| Crystal | Hardlex |
| Size | Diameter: 36.5 mm Lug width: 18 mm |
| Complications | – |
| Hacking | Yes |
| Dial code | 4520-7020 |
| Technical info | Japanese |
| Catalogs | – |